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Is my tach sensor the culprit?

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Old 06-12-2009, 03:54 AM
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Question Is my tach sensor the culprit?

I searched, couldn't find anything relating to my specific problem. When my truck is cold, the tach doesn't work at all. After about 5 minutes of driving it begins to function, how accurately it functions is a mystery. The idle speed it shows is usually different every time I stop. When I use the turn signals, the tach needle bounces(2-300rpm) in sync with the blinker. Could this be the sensor or a cluster issue?
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Old 06-12-2009, 08:21 PM
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Sounds like a dash connection problem to me for the most part because of the blinker induced bounce.
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Old 06-12-2009, 10:22 PM
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I just replaced my tach sensor, and the tach was doing all kinds of weird things like you described (IIRC - even blinker bounce). Got any spare parts, or temporary access to another tach sensor ?
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Old 06-12-2009, 10:32 PM
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Not yet, it's my first diesel and I've only had it a few days. Haven't aquired any spare parts yet.
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Old 06-12-2009, 10:46 PM
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Sounds like the sensor is going. Ford only part and about $60 or so, E5TZ-17B384-A TACH SENSOR
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Old 06-12-2009, 10:49 PM
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Mine only works when you rev the engine. At idle and when coasting it reads zero. Where is this sensor anyways? I'd like to look into replacing it.
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Old 06-12-2009, 10:54 PM
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Tach Sensor Location

-Enjoy
fh : )_~
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Old 06-12-2009, 11:15 PM
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Awesome! Thanks! I think I'll just throw a new one in while I've got the motor out. Does that sensor have anything to do with how the PCM controlls the E4OD or is it a sending unit only?
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Old 06-12-2009, 11:35 PM
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Quote:
Originally Posted by therifleman556 View Post
Awesome! Thanks! I think I'll just throw a new one in while I've got the motor out. Does that sensor have anything to do with how the PCM controlls the E4OD or is it a sending unit only?
It controls quite a bit. Without the sensor, the trans won't work correctly (as well as the TPS/FIPL, speedo drive, brake lights and gear selector). That's one of the reasons I went with a Baumann controller, less inputs to scramble the trans.
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Old 06-12-2009, 11:53 PM
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So the tach sensor could be causing my eratic tach operation and messing with the shifting? Are there any other variables to check?
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Old 06-13-2009, 12:32 AM
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That would cover both of those. You could check the grounds and connections for both, as that would also make it look like a falied component. I still vote for the sensor, they seem to go out after a few years (maybe 20?) of use.
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Old 06-13-2009, 01:21 AM
88f150302 88f150302 is offline
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ok i have a question my tach works when i am cranking it bouces but thats it when it starts it dosnt work at all could that be the sensor?
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Old 06-13-2009, 02:13 AM
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Usually before the sensor fails the the insulation will be cracking and showing bare wires right as they come out of the sensor. If they are it is a sure thing the sensor will not be long for this world.
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Old 06-13-2009, 12:16 PM
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I just noticed that last night on my sensor. The wire is bare for about 2" coming out of the sensor. Guess I will look for a new one.
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Old 06-13-2009, 07:47 PM
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If it's still working, apply a little sillycone (silicone) around where the wires enter it to prevent moister from getting in and shorting it out. They are like something like 50 or 60 bux!

Yea, I know, I would replace it to!

-Enjoy
fh : )_~
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